chore(ci): fix CI pipelines for v2 backports channel

Author: anehx

.github/workflows/ci-build.yml

@@ -17,9 +17,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: volta-cli/action@v1
-        with:
-          node-version: 10.x
+      - uses: volta-cli/action@v4
       - run: yarn install --frozen-lockfile --ignore-engines
       - run: yarn lint
       - run: yarn test
@@ -31,9 +29,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: volta-cli/action@v1
-        with:
-          node-version: 12.x
+      - uses: volta-cli/action@v4
       - run: yarn install --no-lockfile
       - run: yarn test
 
@@ -64,17 +60,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: volta-cli/action@v1
-        with:
-          node-version: 12.x
+      - uses: volta-cli/action@v4
       - name: install dependencies
         run: yarn install --frozen-lockfile
       - name: test
         run: node_modules/.bin/ember try:one ${{ matrix.ember-try-scenario }} --skip-cleanup
 
   types:
     runs-on: ubuntu-latest
-      
+
     needs: test
 
     strategy:
@@ -86,9 +80,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: volta-cli/action@v1
-        with:
-          node-version: 12.x
+      - uses: volta-cli/action@v4
       - name: install dependencies
         run: yarn install --frozen-lockfile
       - name: install TS version

config/ember-try.js

@@ -100,6 +100,7 @@ module.exports = async function () {
         npm: {
           devDependencies: {
             'ember-source': await getChannelURL('release'),
+            '@ember/string': '3.1.1',
           },
         },
       },
@@ -108,6 +109,7 @@ module.exports = async function () {
         npm: {
           devDependencies: {
             'ember-source': await getChannelURL('beta'),
+            '@ember/string': '3.1.1',
           },
         },
       },
@@ -116,6 +118,7 @@ module.exports = async function () {
         npm: {
           devDependencies: {
             'ember-source': await getChannelURL('canary'),
+            '@ember/string': '3.1.1',
           },
         },
       },

package.json

@@ -155,7 +155,7 @@
     }
   },
   "volta": {
-    "node": "12.22.4",
+    "node": "14.21.3",
     "yarn": "1.22.4"
   },
   "typesVersions": {